/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the License);
 * you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.polardbx.optimizer.core.rel.dml.util;

import com.alibaba.polardbx.optimizer.utils.RexUtils;
import lombok.AllArgsConstructor;
import lombok.RequiredArgsConstructor;
import org.apache.calcite.rex.RexNode;

@RequiredArgsConstructor
@AllArgsConstructor
public class BaseRexHandlerCall implements RexHandlerCall {
    public final RexNode rex;
    protected RexNode result;

    @Override
    public void transformTo(RexNode newRex) {
        this.result = newRex;
    }

    public RexNode getResult() {
        return result == null ? rex : result;
    }

    @SuppressWarnings("unchecked")
    public <T extends RexNode> T getRex() {
        return (T) rex;
    }

    @Override
    public RexUtils.RexNodeTransformer buildTransformer() {
        return new RexUtils.BaseRexNodeTransformer(rex);
    }

    @Override
    public RexFilter buildRexFilter() {
        return TypedRexFilter.of(this, (r, p) -> false);
    }

    @Override
    public RexFilter buildRexFilterTree() {
        return buildRexFilter();
    }

    @Override
    public RexHandlerCall copy(RexNode newRex, RexNode result) {
        return new BaseRexHandlerCall(newRex, result);
    }

    @Override
    public RexHandlerCall copy() {
        return new BaseRexHandlerCall(rex);
    }
}
